Officials: 21 Students Exposed To TB At Grant High School

ROCKVILLE, MD - MAY 4: Small glass vial like those that will hold tuberculosis vaccines move through a filling machine during a tour of the Aeras Global TB Vaccine Foundations' new manufacturing plant May 4, 2009 in Rockville, Maryland. (Photo by Chip Somodevilla/Getty Images)

SACRAMENTO (CBS13/AP) — Health officials say 21 students at a Sacramento high school appear to have been exposed to tuberculosis.

The students at Grant High School were given skin tests for the disease after another student there came down with TB. The skin tests came back positive.

County health officials note that it does not mean the students have active TB, which can be fatal. In fact, none of them shows symptoms of the disease. Further, officials note that it is unlikely that any other students have TB.

They will, however, undergo further tests and be treated with antibiotics, as even latent TB can become active years later.

The student who came down with the disease was diagnosed last month and is undergoing treatment.

Symptoms of active TB include a persistent cough and fever. Only active TB is contagious. It is spread through the air.